异养硝化细菌LW的筛选及其硝化性能研究

Research on Filtration of Heterotrophic Nitrification Bacteria LW and Nitrification Performance

从焦化废水活性污泥中分离纯化出一株异养硝化细菌LW。该菌株为革兰氏阴性短杆菌，无芽孢，无鞭毛；菌落为白色圆形，半透明，边缘整齐。通过对该茵株进行硝化性能研究，证实NH4＋-N去除率高达95％以上，TN和CODcr去除率分别为70．97％和91．01％。在NH4＋-N去除过程中有明显的亚硝酸盐积累。通过对该菌株影响因素的研究表明，在pH值为7-8、温度为30％条件下，该菌株对氨氮去除能力较强。研究表明，异养硝化细菌LW适应能力较高，因此具有一定的工业应用价值。

Heterotrophic nitrification bacteria LW was extracted from activity sludge of coking wastewater. The strain is short of gram-negative bacilli, spore, without flagella; Colony is white rounded, translucent, edge neat. Through the study of the ni- trification performance, the paper was confirmed that NHd-N removal rate as high as 95% above, removal rate of TN and CODcr was 70.97% and 91.01% respectively. There was obvious nitrite accumulation in the process of NH4＋-N removal. Through the study of the influence factor of the strain showed that the pH value of 7 - 8, the temperature the condition of 30 ℃, the strain removal ability was stronger. The research showed that the adaptation ability of heterotrophic nitrification bacteria LW was higher, which had a certain value for industrial application.